Gas and air mixer.



A. BOOKING.

GAS AND AIR MIXER.

APPLICATION FILED JULY 28, 1911.

1,053,793. Patented Feb. 18, 1913.

m 33 I I ARTHUR nocxrNe, or NOTTINGHAM, ENGLAND.

GAS AND AIR MIXER.

Specification of Letters Patent.

Patented Feb. 18,1913

Application filed July 28,1911. Serial No. 641,085.

To all whom it may concern:

Be it known that I, {ARTHUR DOCKING, a subject of the King of Great Britain, and a resident of Nottingham, in England, have invented a certain new and useful Gas and Air Mixer, of which the following is a specification. v

This invention relates to apparatus for supplying amixture of say for example gas and atmospheric air, for lighting or heating purposes, and refers more particularly to apparatus of the kind in which the two gases are drawn in and compressed to the pressure required by the service, by means of a rotary or other suitable compressor.

The present invention refers to improved means for controlling the supply of gas and air to meet the varying demands of the service, and at the same time maintain the proportions of the gas and air constant, under all the different demands of said service.

Apparatus is already well known in which a varying supply of mixture of gas and air in the correct proportions, has been regulated by the pressure on the service side of the compressor, the exhaust side, and in some cases both have been utilized, but owing to the fact that the effective pressure in this class of apparatus is very low, and that the valves have hitherto worked one independently of the other, trouble has been caused by one or more of the controlling valves sticking and either cutting oil the supply altogether, or failing to give the proper proportions of gas and air under all conditions.

In the present arrangement the by-pass and inlet controlling valves are positively connected by mechanical means one to the other, and automatically and simultaneously adjusted by the service pressure. Being all mechanically connected together as described, they must move together, and such movements must always be proportionate one to the other, as is predetermined by their mechanical connections, irrespective of any influence which may be separately exerted upon the valves by the velocity of the gases, or by the suction at the inlets.

Referring to the drawing, the figure is a vertical section showing apparatus constructed according to my invention.

An ordinary compressor A of the rotary or other suitable type isemployed, and the inlet A of this compressor A, is connected by a pipe B to a gas inlet valve casingC, and by a pipe D to an air inlet valve casing E. The inlet valve casings C and E described, are fitted with valves 0 and E respectively, andv said valves are automatically adjusted so as to admit the proper portions of gas and air required to meet the varying conditions, by means hereinafter described. a

The mixed gases, the proportions of which are as already stated controlled by the inlet valves C and E described, are compressed to the required pressure into a service chamber G, which is connected to the outlet A? of the compressor A, by means of a pipe H, and from this chamber Gthe gases are conveyed to the required points, by one or more service pipes J connected to said chamber G.

The inlet valve casings C and E pre- 'viously referred to, are divided between their respective inlets and outlets by .horizontal partitions O and E respectively, and the valves 0 and E which are preferably of the cylindrical type, workin circu lar openings of'ithe same size in the res ective partitions. The valves C and E w ich are closed at the top and open at the bottom, are provided with ports C and E in their cylindrical walls, so that the effective area of the actual inlet openings, can be varied by raising and lowering the .said

valves to a more or less extent. This is effected through the intermediary of their respective valve stems C and E, which are carried through stutiin boxes at the top of the respective casings g and E in the usual manner.

Situated above the, servicechamber Gris a by-pass casing F, fitted with a by-pass valve K of the piston type. The lower end of the casing F is open to the service chamber G, while a port F in its side, which is normally closed by the by-pass valve K, is connected by a pipe L to the pipe B in connection with the inlet A of the compressor A.

The stem K of the by-pass valve is carried ried above the by-pass casing F.

The space in the diaphragm chamber N on .the underside of the diaphra m M, is connected to the service chamber preferably by means of a pipe 0 having a restricted opening, so that the action of the said diaphragm M which is controlled by the pressure in the said chamberG, shall be steady under sudden changes'of pressure.

The stem K of the by-pass valve K is carried up above the diaphragm M and out through an opening in the top diaphragm chamber N, and its upper end is connected by levers P P and links P P to the stems C and E of the respective inlet valves 0 and E which are for convenience situated on opposite sides of the said diaphragm chamber N.

The arrangement described is so disposed that the inlet valves 0 and E are lowere and thus closed to a more or less extent, when the by pass valve K is raised. The amount of closing movement imparted to the respective inlet valves 0 and E relatively to the opening movement of the by-pass valve K, is in each case determined by the disposition of the fulcrums on the respective levers P and P, which are carried by the upper free ends of arms Q Q respectively, pivoted to the top of the diaphragm casing N.

The operation of the apparatus is as follows :The diaphragm M in connection with the bypass valve K is weighted according to the pressure required inv the service, an when this pressure is exceeded, owin to the demand being less than the supply rom the compressor A, the said diaphragm M and the by-pass valve K are raised, thus opening the port F and permitting the surplus mixture to pass by way of said port and pipe L back to the compressor A again. At the same time the by-pass valve K is opened, the inlet valves C and E are closed to an extent determined by their respective connections, so that they will only admit sufiicient gas and air to maintain the pressure in the servicechamber G, while the mixed gases in the apparatus above and beyond the demands of the service for the time being, are constantly circulated by the compressor A as is usual,

assing from the service chamber G into the y-pass casing F, and then from the latter by way of the port F and pipe L back to the com aressor agam.

T e gas ma be supplied to the gas inlet valve casing d at atmospheric pressure, by employing a regulator or governor of the usual construction.

In the arrangement described, the inlet valves C and E being positively connected to and closed when the by-pass valve K is opened, and the latter beingvcontrolled by the full pressure of the gas in the service chamber G, it not only follows that all of the valves described always work in unison, and there is consequentl no risk of either of them sticking, but w en the apparatus is out of action, the by-pass valve is quite closed, and the inlet valves 0} and E necessarily wide open, so that in starting the full supply is first obtained, before the said valves are closed or partially closed, in order to out dowr the supply to meet the existing deman What I claim as my invention and desire to cover by Letters Patent'is:

1. In apparatus for supplying a mixture of gas and air or the like, the combination of a compressor, a by-pass a by-pass valve for regulating the return 0 a the surplus mixture to the suction side of the compressor, means for controlling said valve, inlet valves for controlling the supply of air and gas admitted to the compressor, and means for con necting the said inlet valves to the by-pass valve whereby the former are positively closed proportionately to the opening of the latter substantially as described.

2. In apparatus for supplying a mixture of gas and air or the like, the combination of a compressor, a by-pass, a by-pass valve for regulating the return of the surplus mixture to the suction side of the compressor, a

diaphragm subject to the service pressure for controlling said valve, inlet valves for controlling the supply of air and as admitted to the compressor, and means or connecting said inlet valves to the by-pass valve whereby the former are positively closed proportionately to the openlng of the latter, substantially as described.

3. In apparatus for supplying a mixture of gas and air or the like, the combination of a compressor, a by-pass, a by-pass valve for regulating the return of the surplus mixture from the service to the suction side of the compressor, a diaphragm which is subject to the service pressure Ior controlling the said valve, inlet valves for controlling the supply of air and gas admitted to the compressor, and a s stem of levers connecting the said inlet va ves to the by-pass valve and positively closing the former propor tionatel to the opening of the latter, substantial y as described.

4. In apparatus for suppl ing a mixture of gas and air or the like,tlie combination of a compressor, a by-pass, a service chamber which is connected to both the service and suction side of the compressor, a by-pass valve for regulating the return of the surplus mixture from said service chamber to the compressor, a diaphragm chamber connected to the service chamber, a diaphragm in said chamber connected to and controlling the by-pass valve, inlet valves for controlling the supply of air and gas admitted to the compressor. and a system of levers for conmeeting said inlet valves with the by-pass valve and ositively closing the former proportionatey to the opening of the latter, substantially as described.

In testimony whereof I have signed my name'to this specification in the presence of 10 two subscribing witnesses.

ARTHUR DOCKING.

Witnesses:

H. C. SHELDON, JOHN B. JAINSON. 

